import { Injectable } from '@angular/core'
import { Observable } from 'rxjs/Observable'
import { Subject } from 'rxjs/Subject'
import { AccountService } from './account.service'

@Injectable()
export class Principal {
    private userIdentity: any
    private authenticated = false
    private authenticationState = new Subject<any>()

    constructor(private account: AccountService) {
    }

    authenticate(identity) {
        this.userIdentity = identity
        this.authenticated = identity !== null
        this.authenticationState.next(this.userIdentity)
    }

    hasAnyAuthority(authorities: string[]): Promise<boolean> {
        return Promise.resolve(this.hasAnyAuthorityDirect(authorities))
    }
    hasAnyAuthorityDirectOne(authority: string): boolean {
        return this.hasAnyAuthorityDirect([authority])
    }
    hasAnyAuthorityDirect(authorities: string[]): boolean {
        // console.log(this.authenticated)
        if (!this.authenticated || !this.userIdentity || !this.userIdentity.authorities) {
            return false
        }
        // console.log(this.userIdentity.authorities)
        for (let i = 0; i < authorities.length; i++) {
            if (this.userIdentity.authorities.includes(authorities[i])) {
                return true
            }
        }

        return false
    }

    hasAuthority(authority: string): Promise<boolean> {
        if (!this.authenticated) {
            return Promise.resolve(false)
        }

        return this.identity().then((id) => {
            return Promise.resolve(id.authorities && id.authorities.includes(authority))
        }, () => {
            return Promise.resolve(false)
        })
    }

    identity(force?: boolean): Promise<any> {
        if (force === true) {
            this.userIdentity = undefined
        }

        // check and see if we have retrieved the userIdentity data from the server.
        // if we have, reuse it by immediately resolving
        if (this.userIdentity) {
            return Promise.resolve(this.userIdentity)
        }

        // retrieve the userIdentity data from the server, update the identity object, and then resolve.
        return this.account.get().toPromise().then((account) => {
            if (account) {
                this.userIdentity = account
                this.authenticated = true
            } else {
                this.userIdentity = null
                this.authenticated = false
            }
            this.authenticationState.next(this.userIdentity)
            return this.userIdentity
        }).catch((err) => {
            this.userIdentity = null
            this.authenticated = false
            this.authenticationState.next(this.userIdentity)
            return null
        })
    }

    isAuthenticated(): boolean {
        return this.authenticated
    }

    isIdentityResolved(): boolean {
        return this.userIdentity !== undefined
    }

    getAuthenticationState(): Observable<any> {
        return this.authenticationState.asObservable()
    }

    getImageUrl(): String {
        return this.isIdentityResolved() ? this.userIdentity.imageUrl : null
    }
    getUserId(): String {
        return this.isIdentityResolved() ? this.userIdentity.loginId : null
    }
    getUserName(): String {
        return this.isIdentityResolved() ? this.userIdentity.name : null
    }
}
